Combined ellipsograph and square.



s. LEVINE. COMBINED ELLIPSOGRAPH AND SQUARE.

APPLICATION FILED SEPT. 12, 1912.

Patented Aug. 5, 1913.

snivrnnr. LEVINE,

OF CLEVELAND,

OHIO.

COMBINED ELLIPSOGRAPH AND SQUARE.

Application filed September 12, 1912.

To all whom it may concern Be it known that I, SAMUEL LEVINE, a subject of the Emperor of Russia, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented certain new and useful Improvements in Combined Ellipsographs and Squares, of which the following is a specification.

This invention is a combined ellipsograph and square, and has for its object to provide an improved construction which can be used for drawing ellipses or circles or parts thereof, and which can also be used as a simple square, the ellipsograph attachment being removable if not needed.

The instrument will be capable of use by draftsmen and mechanics, for the various purposes referred to, and can be produced at much less cost than various machines now used for the purpose of drawing ellipses.

In the acompanying drawingsFigure 1 is a plan view of the entire device. Fig. 2 is a plan view showing the separate parts. Fig. 3 is a section on the line 3-3 of Fig. 1. Fig. 4: is a side view of the pencil holder. Fig. 5 is a plan view of the square, the ellipsograph attachment being removed. Fig. 6 is a perspective showing the joint between the arms of the square. Fig 7 is a section on the line 77 of Fig. 5.

Referring specifically to the drawing, 6 and 7 indicate the arms forming the square. In one side of these arms are undercut guide grooves 8, which are parallel to the long edges of the arms. In one groove 8 slides a bar 9 which has at its outer end a block 10 pivoted thereto as indicated at 10 and this block is provided with a tightening nut 11. In the groove 8 of the other arm is a slidable bar 12 which is also provided with a block 13 pivoted thereto and provided with a clamping screw 14. A rod 15 eX- tends through the pivoted blocks 10 and 13, and this rod can be adjusted inor out, and fixed at adjustment by the screws 11 andli, and the pivotal connection between the rod 15 and the bars 9 and 12 permit the rod to be swung around to scribe curves. At its outer end the rod 15 has a hole 16 for a pencil. Screw holes 17 are provided at the outer ends of the arms, so that the Specification of Letters Patent.

Patented Aug. 5,1913.

Serial No. 720,070.

square can be fastened to a board if desired. The arms are fastened together by screws 21 connected to the lapped ends of the arms and holding the same in rectangular position.

To scribe curves, the rod 15, connected and adjusted as above indicated is swung around, and the bars 9 and 12 slide in the grooves in the manner of a trammel, the pencil describing an ellipse. To describe a circle the rod 9, for example, is removed, and the rod 15 may then be swung around, with the pivoted block 13 as center, to describe a circle. The arms of the square and the rod are provided with the usual scales. To use the device as a simple square, as illustrated in Figs. 5 and 6, the arms are disconnected by removing the screws 21, and the other ends of the arms are then connected as shown in Figs. 5 and 6, one end of the arm 7 being provided with a tenon 19 which fits in a slot 18 in the other arm, which are fastened together by a screw 20 and nut 22 working in recesses in the adjacent ends of the arms. \Vhen so used as a square the scribing attachment is removed by sliding out the rod 15 and the bars 9 and 12.

I claim:

1. The combination with a square the arms of which have longitudinal guideways at a right angle to each other, of a curve scribing attachment comprising bars slidable in said guideways, and a rod provided with a marking device and pivotally connected to the ends of the bars adjacent the corner of the square.

2. The combination with a square the arms of which have longitudinal grooves at a right angle to each other, of a curve scribing attachment comprising bars slidable in said grooves and crossing each other at the corner of the square, a pivoted block at the end of each bar, a rod extending through each of the blocks and adjustably fastened thereto, and a marking device on the rod.

3. A combined square and ellipsograph, comprising arms provided at each end with connecting devices whereby they may be connected at either end, said arms having longitudinal grooves which are open at the In testimony whereof, I do afiix my signacorner of the square When the arms are ture in presence of tWo wltnesses. connected in one of said posltlons, bars T slidable in said grooves, and a rod pr0- E LE' vided with a marking device and pivotally Witnesses: connected to the ends of the bars adjacent I JOHN A. BOMMHARDT, the said corner of the square. STEDMAN J. ROCKWELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

